Abstract
The Gas Tungsten Arc Welding (GTAW) process has been used for many years in the joining of carbon steel, alloy steel and non-ferrous alloys. Its capacity to deposit an external root, the ability to choose filler metals for a wide variety of base metals, and its favorable deposition characteristics make this a versatile process which is associated with low defect susceptibility, and excellent weld metal properties. Unfortunately, the GTAW process has not historically been associated with high productivity rates. Past efforts to enhance productivity through "hot wire" technology have improved the GTAW process markedly. Nevertheless, even with "hot wire"technology, the establishment of a GTAW root pass has not been considered competitive with existing GMAW mechanized processes. The objective of this project is to optimize the productivity of the GTAW process for girth welding of pipelines using activating fluxes.
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